One big difference between doing business domestically and internationally is culture. According to Hilka Klinkenberg, founder of Etiquette Internationalin New York City, less than 25 percent of U.S. business ventures abroad are successful. "A lot of that is because Americans don't do their homework or because they think the rest of the world should do business the way they do business," she says. Klinkenberg offers the following tips to avoid making costly mistakes in international business meetings: